Wireless Communication MCQs | Wireless Communication Short Questions and Answers

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Questions
41 Global Positioning System uses
A CDMA
B TDMA
C SDMA
D FDMA

Answer: CDMA
42 The guard interval is provided in OFDM
A To eliminate the need of pulse shaping filter
B To eliminate ISI
C High symbol rate
D Both a and b

Answer: Both a and b
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43 Packet radio refers to
A Multiple users on single channel
B Single user on multiple channels as per demand
C Multiple users on multiple channels at different time slots
D All of the above

Answer: Multiple users on single channel
44 Disadvantages of packet radio are
A Induced delays
B Low spectral efficiency
C Large spectrum required
D Both a and b

Answer: Both a and b
45 Pure ALOHA is a
A Hybrid access protocol
B Demand access protocol
C Scheduled access protocol
D Random access protocol

Answer: Random access protocol
46 The increase in number of users in PURE ALOHA causes
A Increase in delay
B Increase in probability of collision
C Increase in spectrum
D Both a and b

Answer: Both a and b
47 SDMA technique employs
A Smart antenna technology
B Use of spatial locations of mobile units within the cell
C More battery consumption
D Both a and b are correct

Answer: Both a and b are correct
48 The increased capacity of SDMA is due to
A Focused signal transmitted into narrow transmission beams
B Smart antennas pointing towards mobile stations
C Use of different frequencies at same time slot
D Both a and b are correct

Answer: Both a and b are correct
49 ———– introduced Frequency Modulation for mobile communication systems in 1935.
A Edwin Armstrong
B Albert Einstein
C Galileo Galilei
D David Bohm

Answer: Edwin Armstrong
50 Paging systems were based on
A Simplex systems
B Half duplex systems
C Full duplex systems
D None of the above

Answer: Simplex systems
51 2G CDMA standard – cdma one supports up to
A 8 users
B 64 users
C 32 users
D 116 users

Answer: 64 users
52 3G W-CDMA is also known as
A UMTS
B DECT
C DCS-1800
D ETACS

Answer: UMTS
53 The minimum spectrum allocation required for W-CDMA is
A 5MHz
B 2MHz
C 500KHz
D 100KHz

Answer: 5MHz
54 Spectrum Efficiency of a cellular network is
A The traffic carried by whole network
B The traffic carried per cell divided by the bandwidth of the system and the area of a cell
C Expressed in Erlang /MHz /km2
D Both b and c

Answer: Both b and c
55 In Handoff
A Process of transferring the call to the new base station
B Transfers the call
C New channel allocation is done
D All of the above

Answer: All of the above
56 Inter system Handoffs are done
A When mobile station moves in two cellular systems with different MSC
B When mobile station moves between two cellular systems
C When mobile station receives more power from other base station than the serving base station
D All of the above

Answer: All of the above
57 Dwell time is the time for
A A call within the cell
B Hand off
C Waiting for channel allocation
D None of the above

Answer: A call within the cell
58 Dwell time depends upon
A Interference
B Distance between the subscriber and the base station
C Propagation of call
D All of the above

Answer: All of the above
59 GSM is an example of
A TDMA cellular systems
B FDMA cellular systems
C CDMA cellular systems
D All of the above

Answer: TDMA cellular systems
60 In Mobile Assisted Handoff (MAHO), the handoff takes place when
A The power received by the mobile station from other base station is more than the serving base station
B The channel allocated is not available
C The mobile station has no signal
D All of the above

Answer: The power received by the mobile station from other base station is more than the serving base station

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